Houdini How to solve fluid

Effect display ：

Mind map notes ：

One 、 Particle liquid creation

• Particle liquid creation

1、Ctrl+ Left mouse button Create a sphere in the shortcut bar , Ready to add a fluid effect to the sphere .

2、Particle Fluids Select... From the shortcut bar <Flip Fluid form OBJ>.( The effect of flowing out of an object )

3、 After adding fluid to the selected object , The node control window will have four nodes that can be adjusted , The main adjustment content is the selected node .

• Liquid material modification and display

1、 In the right material control panel , Drag the shader onto the fluid .

2、 In the left toolbar , Point selection Area rendering button , Preview the fluid state .

3、 The default material given here is blue , Adjust to water transparent , Choose the shader , And cancel the check Enable Diffuse.

4、 At this time, the area rendering can see that the water droplets are transparent .

Two 、 Particle liquid collision

• Create collider StaticObject

1、 Create a Box object , And adjust box The size is 4.

2、 Yes Box Delete 3 Face to face , Easy preview , In select mode , Press 4, Delete the opposite .

3、 After deleting the face , choice Box, And add rigid body components <Static Object> Components .

 

• One side of the collision body is extruded into two sides

1、 After adding rigid body components , Double click in , add to （ Extrude face nodes ）polyExtrued. node , And adjust Box Thickness and subdivision .

• Preview collision solution

1、 by Box Add collision range and preview range , Check Collision Guide Displays the collision range ,Division Size Controls the size of the collision range ( The blue part shows the collision area ).

2、 At this time, slide the time bar , You will see , Particle solving has played a collision role .

3、 ... and 、 Solve cache and render output

• Create solution cache

  ( Render information , Cache to hard disk , In this way, you don't need to re occupy rendering resources when you open it again , Save a lot of time )

1、 Select the node , And enter node selection Impurt Sphere object1, In the details panel , Select the save cache path and name .

2、 open (sphere_object1_fluid>>import_sphere_object1) node , Check (Save Frame Range) command , Set the frame number range of rendering save .

3、 Select the save path and name ( Naming rules ：< name , frames , Format >)

(1)、Drop.$F4.bgeo.gz

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(2)、 name ------ Frame number ------ The default format ------- Compressed file format

4、 After selection , Click on Save to Disk Start solving , or Save to Disk inBackground Button to save the cached information .

（ If the progress bar is not displayed normally or ,File Cannot read , Then you can enter the folder and delete the original cache , Re solve the information ）

• File The node reads the cache path

1、 Press Tab key , Create File node , And in Geometry File Choose from , The information cached above , Specify on this path .

2、 Check Load From Disk after , Open the project again , The cached information can be read , And you don't need to solve it again every time .

3、 Set no rendering range , Save solving time and computation .

（1）、 establish Box Or arbitrarily shaped objects

（2）、 Click... In the shortcut bar of the window Sikn From Objects Button , Then select the fluid object and press Enter confirm .

（3）、 After confirming the generation , Start solving and running , after Box Excess fluid in the range , Will disappear , Save solution resources .

• Create render nodes and export

1、 Create a render node ,RPO>> And enter node creation Mantra node ( Screenshot )

2、Mantra The node can control the output Format , route and frames etc. . choice Valid Frame Range ==Render Frame Range command , And in Output Picture in Set the output path and Format name .

3、       Water04$F4.TGA----------- Name according to the above format .

              name --- Separator --- Image format

4、 After the save , Create lights , And the lights , Rendering .

              In the shortcut bar , Click the light , And lens , And lock the current ( Lens or light ) Adjust the position of camera and light from the angle , unlocked , You can observe freely .

5、 When the angle is selected , Get into RPO Medium Mantra1 In nodes ,Render to Disk. Start rendering .

6、 Next, wait for the output to be a sequence , And deal with it .（ The ultimate goal here is to enter Unity Use in , So there will be branches of the export part , Coming soon ）.

Four 、 Case download address